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SOLAR/1025-79/03 

Monthly 

Performance 

Report 



HELIO THERMICS, INC. - LOT 6 

MARCH 1979 



U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

HELIO-THERMICS, INC. 
HOUSE LOT 6 

MARCH 1979 



I. SYSTEM DESCRIPTION 

Helio-Thermics Inc., House Lot 6 is one of two instrumented single-family 
residences in Greenville, South Carolina. The home has approximately 1086 
square feet of conditioned space. Solar energy is used for space heating the 
home and preheating domestic hot water (DHW). The solar energy system utilizes 
the attic space as the solar energy collector. The attic roof faces 10 degrees 
west of south and is pitched at an angle of 51 degrees from the horizontal. 
Solar energy enters the attic through a 416-square-foot aperture which is 
double-glazed with corrugated, translucent, fiberglass-reinforced, acrylic 
panels. The interior of the attic is painted black to maximize the absorption 
of solar energy. Warm air accumulates in the peak of the attic roof and 
circulates through the conditioned space or through storage by an eir handler. 
Solar energy is stored in an 870-cubic-foot storage bin containing 85,460 
pounds of crushed rock. The bin is located under the house and is insulated 
with 2-inch polystyrene insulation. Cold water is preheated in the attic by 
thermosiphoning water from the 80-gallon preheat tank through a manifold 
system of copper tubes. These tubes are attached to black sheet-metal plates, 
thus enhancing absorption of solar radiation for preheating the water as it 
circulates to and from the preheat tank. Preheated city water is stored in 
the preheat tank and supplied, on demand, to a conventional 80-gallon DHW 
tank. When solar energy is insufficient to satisfy the space heating load, a 
water-to-air heat exchanger in the hot air supply-duct provides auxiliary 
energy for space heating. A gas-fired water heater provides auxiliary energy 
for the water-to-air heat exchanger and DHW. The system, shown schematically 
in Figure 1, has seven modes of operation. 

Mode 1 - Col lector-to-Storage : This mode activates when there is no demand 
for space heating and the collector supply-duct temperature is 26°F higher 
than the storage temperature. This mode terminates when the temperature 
difference between the collector and storage is less than 16°F. 

Mode 2 - Storage- to-Space Heating : This mode activates when space heating is 
required (but is not available from the collector) and the storage tempera- 
ture exceeds the building ambient temperature by 5°F. This mode terminates 
when the building ambient temperature equals the storage temperature or when 
space heating is no longer required. 

Mode 3 - Collector-to-Space Hea ting: This mode activates when space heating 
is required and the collector supply-duct air temperature is 10°F higher than 
the building ambient air temperature. This mode terminates when the tempera- 
ture difference drops to less than 6°F or the space heating requirement is 
satisfied. 




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Mode 4 - Auxiliary Energy- to-Space Heating : This mode activates when space 
heating is required and thermal energy is not available from the collectors 
or storage. An electrical heating element in the hot air supply-duct remains 
on until the space heating demand is satisfied. 

Mode 5 - Summer Mode, Passive Cooling Storage : This mode can be activated 
when the residents wish to store cool air in storage for circulation the next 
day. The air-handler fan activates and an outside air-intake damper opens to 
allow the cool air to circulate through the attic and storage. 

Mode 6 - Summer Mode, Space Cooling : This mode can be activated when cool 
air from storage is desired in the living area. The outside air-intake 
damper closes, the duct to the living area opens, and the air-handler fan 
activates. 

Mode 7 - DHW Preheating : This mode activates when there is a demand for hot 
water. Water is drawn from the conventional DHW tank and replenished with 
heated water from the preheat tank. The DHW subsystem has this one independent 
mode of operation for preheating. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was occupied in March and the solar energy system operated contin- 
uously for 31 days during the month. Solar energy satisfied 75 percent of the 
space heating requirements. The solar energy system provided fossil fuel 
energy savings of 0.68 million Btu. 

To prevent the possibility of water freezing in the thermosiphoning subsystem, 
this solar energy system component (located in the attic) has been drained 
until all danger of freezing has past. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 20.1 
million Btu for a daily average of 1560 Btu per square foot. This was above 
the estimated average daily solar radiation for this geographical area during 
March of 1476 Btu per square foot for a south-facing plane with a tilt of 51 
degrees to the horizontal. The average ambient temperature during March was 
52°F a compared with the long-term average for March of 51 °F. The number of 
heating degree-days for the month (based on a 65'T reference) was 394, as 
compared with the long-term average of 450. 

THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for the 
month of March was 20.1 million Btu. During the period the collector loop 



was operating the total insolation amounted to 16.3 million Btu. The total 
collected solar energy for the month of March was 4.1 million Btu, resulting 
in a collector array efficiency of 21 percent, based on total incident insola- 
tion. Solar energy delivered from the collector array to storage was 3.0 mil- 
lion Btu, while solar energy delivered from the collector array directly to the 
loads amounted to approximately 0.05 million Btu. Energy loss during transfer 
from the collector array to storage and loads was approximately 1.1 million 
Btu. This loss represented 27 percent of the energy collected. Operating 
energy required by the collector loop was 0.37 million Btu. 

Storage - Solar energy delivered to storage was 3.0 million Btu. There were 
0.36 million Btu delivered from storage to the space heating subsystems. Energy 
loss from storage was 2.4 million Btu. This loss represented 80 percent of 
the energy delivered to storage. This "lost" thermal energy is probably entering 
the living area and contributing to the lower-than-average space heating load. 
The predicted space heating load was 3.0 million Btu based upon actual ambient 
temperatures, considerably higher than the actual load of 0.55 million Btu. The 
storage efficiency was 20 percent: This is calculated as the ratio of the sum 
of the energy removed from storage and the change in stored energy, to the 
energy delivered to storage. The average storage temperature for the month was 
82°F. 

DHW Load - There was no solar energy contribution to the DHW load of 1.7 
million Btu because the thermosi phoning subsystem had been drained. A daily 
average of 66 gallons of DHW was consumed at an average temperature of 155°F 
delivered from the tank. 

Space Heating Load - The space heating subsystem consumed 0.41 million Btu of 
solar energy and at least 0.14 million Btu of auxiliary thermal energy (equiva- 
lent to 0.23 million Btu of auxiliary fossil fuel energy) to satisfy a space 
heating load of 0.55 million Btu. The solar fraction of this load was 75 per- 
cent. The space heating subsystem consumed a total of 0.22 million Btu of 
operating energy, to distribute both solar energy and auxiliary thermal energy. 

OBSERVATIONS 

The gas flow totalizer used to quantify the gas consumption is not providing 
valid data. The measurement of auxiliary thermal energy consumption in the DHW 
subsystem will not be available until this problem is corrected. 

ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 0.68 
million Btu. 

III. ACTION STATUS 

Boeing will schedule a site visit in the near future to correct the erroneous 
gas totalizer data readings. 



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